I wouldn't say it's impressive. Something as massive as warcraft has a momentum to it and die hards (of which their are quite a few) aren't likely to go anywhere.
As for all the TBC guys I'm just gonna say that it isn't 2008 anymore. The game had to move away from it. The fact that in MoP the developers have attempted to regress the game at all is stunning and it shows a real lack of any ability on their part to innovate.

MMO-Champion

